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Method for producing chlorobenzene and dichlorobenzene by catalytic distillation and degradation of hexachlorobenzene

A catalytic distillation and catalytic distillation tower technology, applied in the field of selective catalytic hydrogenation, can solve the problem of low concentration of hexachlorobenzene, and achieve the effects of good selectivity, strong practicability and high efficiency

Inactive Publication Date: 2019-03-19
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Li Fanxiu and others used titanium dioxide photocatalysis to study the degradation of hexachlorobenzene wastewater, and the results showed that the method of photocatalysis is feasible, but the experiment is limited to hexachlorobenzene wastewater, the concentration of hexachlorobenzene is low, and it is not suitable for the treatment of high concentration Further research is needed on the degradation of HCB waste

Method used

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  • Method for producing chlorobenzene and dichlorobenzene by catalytic distillation and degradation of hexachlorobenzene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Catalyst preparation

[0030] Dissolve 0.44g of cobalt chloride and 4.28g of lithium chloride into 100mL of 50% ethanol aqueous solution, add 98.3g of θ-alumina, impregnate for 12 hours, then place in an oven to dry at 150°C for 4 hours, and then put Calcined at 600° C. for 2 hours in a muffle furnace to obtain a catalyst precursor. Dissolve 0.67g of palladium chloride and 0.66g of iridium chloride into 110mL of 50% methanol aqueous solution, add the above-mentioned catalyst precursor, soak for 12 hours, then place in an oven to dry at 150°C for 4 hours, and then put it in a Calcined at 600°C for 2 hours in a furnace to obtain the catalyst. The supported amounts of palladium, iridium, cobalt and lithium in the catalyst are 0.4wt%, 0.4wt%, 0.2wt% and 0.7wt%, respectively.

[0031] 2. Catalyst loading

[0032] The fixed-bed catalytic distillation tower is divided into six sections equally from top to bottom, and the catalyzer diluted with coconut shell particle carb...

Embodiment 2

[0038] 1. Catalyst preparation

[0039] Dissolve 1.10g of cobalt chloride and 3.05g of lithium chloride into 100mL of 50% ethanol aqueous solution, add 98.3g of θ-alumina, impregnate for 12 hours, then dry in an oven at 150°C for 4 hours, and then put Calcined at 600° C. for 2 hours in a muffle furnace to obtain a catalyst precursor. Dissolve 0.67g of palladium chloride and 0.49g of iridium chloride into 110mL of 50% methanol aqueous solution, add the above-mentioned catalyst precursor, soak for 12 hours, then place in an oven to dry at 150°C for 4 hours, and then put it in a Calcined at 600°C for 2 hours in a furnace to obtain the catalyst. The supported amounts of palladium, iridium, cobalt and lithium in the catalyst are 0.4wt%, 0.3wt%, 0.5wt% and 0.5wt%, respectively.

[0040] 2. Catalyst loading

[0041]The fixed-bed catalytic distillation tower is divided into six sections equally from top to bottom, and the catalyzer diluted with coconut shell particle carbon is fill...

Embodiment 3

[0047] 1. Catalyst preparation

[0048] Dissolve 0.44g of cobalt chloride and 2.44g of lithium chloride into 100mL of 50% ethanol aqueous solution, add 98.8g of θ-alumina, impregnate for 12 hours, then dry in an oven at 150°C for 4 hours, and then put Calcined at 600° C. for 2 hours in a muffle furnace to obtain a catalyst precursor. Dissolve 0.67g of palladium chloride and 0.33g of iridium chloride into 110mL of 50% methanol aqueous solution, add the above-mentioned catalyst precursor, soak for 12 hours, then place in an oven to dry at 150°C for 4 hours, and then put it in a Calcined at 600°C for 2 hours in a furnace to obtain the catalyst. The supported amounts of palladium, iridium, cobalt and lithium in the catalyst are 0.4wt%, 0.2wt%, 0.2wt% and 0.4wt%, respectively.

[0049] 2. Catalyst loading

[0050] The fixed-bed catalytic distillation tower is divided into six sections equally from top to bottom, and the catalyzer diluted with coconut shell particle carbon is fil...

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Abstract

The invention discloses a method for producing chlorobenzene and dichlorobenzene by catalytic distillation and degradation of hexachlorobenzene. The method adopts a fixing bed catalytic distillation tower to gradually remove chlorine on the hexachlorobenzene in a sectional catalytic hydrogenation manner, the hexachlorobenzene and hydrogen enter from the bottom of the fixing bed catalytic distillation tower, and preform a dechlorination reaction through a catalyst bed layer. As the boiling point of the generated product is gradually reduced, the product moves upwards and exits from the top of the tower. The composition of the product at the top of the tower can be controlled by controlling the catalyst and catalytic reaction conditions, so that the purity of the obtained dichlorobenzene andchlorobenzene can reach more than 99%.

Description

technical field [0001] The invention belongs to the technical field of selective catalytic hydrogenation, in particular to a method for degrading hexachlorobenzene to chlorobenzene and dichlorobenzene by selective catalytic hydrogenation dechlorination. Background technique [0002] In 2017, the International Agency for Research on Cancer of the World Health Organization listed hexachlorobenzene (HCB) in the list of 2B carcinogens. The pollution of HCB to the environment mainly comes from agricultural production and chemical pollution. In agriculture, HCB is used as a fungicide to protect onion, wheat, sorghum seeds and disinfect the soil. In the chemical industry, HCB is also used as a solvent, and as a manufacturing intermediate or additive in the production of synthetic rubber, polyvinyl chloride (PVC) plastics, pyrotechnics, ammunition, wood preservatives and dyes. Hexachlorobenzene is also produced during the combustion of municipal waste. [0003] The degradation met...

Claims

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Application Information

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IPC IPC(8): C07C17/23C07C25/06C07C25/08B01J23/89
CPCB01J23/8946C07C17/23C07C25/06C07C25/08Y02P20/10
Inventor 林涛程杰张炳亮张力万克柔张之翔曾永康曾利辉高武
Owner XIAN CATALYST NEW MATERIALS CO LTD
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